From author's website:
You're a good dungeon master. You've read both Dungeons and Dragons 4th Edition Dungeon Master’s guides. You’ve run a few games. You pick up ideas here and there on the net. Or maybe you're an old grizzled vet whose run games for 20 years.

Maybe your game is feeling a little stale. Maybe your encounters didn’t run exactly as you wanted them too. Maybe you feel like you're stuck in a rut. Maybe you feel a bit overwhelmed when you have to come up with an exciting, creative game every week.

You’re not looking for a huge tome on game theory. You don’t need yet another take on world-building. You’re looking for some practical tips you can use today to help you focus your energy in the right places and make some kick-ass D&D games for you and your friends. You want something you can read quick and start using right away.

My friend, here is the book for you.

This book was written to give you solid usable tips to help you build your story, design exciting encounters, and run a great game when you’re at the table. It’s a short book, designed to be read quickly and referenced often.